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/*****************************************************************************
*
* grail - Gesture Recognition And Instantiation Library
*
* Copyright (C) 2010-2011 Canonical Ltd.
*
* This program is free software: you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation, either version 3 of the License, or (at your
* option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program. If not, see <http://www.gnu.org/licenses/>.
*
****************************************************************************/
#ifndef GRAIL_EVBUF_H
#define GRAIL_EVBUF_H
#define DIM_EVENTS 4096
struct evbuf {
int head;
int tail;
struct input_event buffer[DIM_EVENTS];
};
static inline void evbuf_clear(struct evbuf *evbuf)
{
evbuf->head = evbuf->tail = 0;
}
static inline int evbuf_empty(const struct evbuf *evbuf)
{
return evbuf->head == evbuf->tail;
}
static inline void evbuf_put(struct evbuf *evbuf,
const struct input_event *ev)
{
evbuf->buffer[evbuf->head++] = *ev;
evbuf->head &= DIM_EVENTS - 1;
}
static inline void evbuf_get(struct evbuf *evbuf,
struct input_event *ev)
{
*ev = evbuf->buffer[evbuf->tail++];
evbuf->tail &= DIM_EVENTS - 1;
}
#endif
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